再処理廃液の沸騰乾固模擬ツールの開発

概要

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The development of an accident consequence analysis method has been carried out at Japan Atomic Energy Agency for the development of a probabilistic safety assessment method for nuclear fuel facilities. A computer tool has been developed to simulate the boiling event of reprocessed liquid waste, which is postulated to occur due to the loss of the cooling function at a fuel reprocessing plant. The thermodynamic properties of a nitric acid solution containing radioactive waste in boiling and condensing states are necessary to quantitatively assess the amount of radioactive materials transferring to the gas phase. The developed tool simulates the boiling and condensation processes of liquid waste based on ebullioscopy. A simulation study demonstrated that the behaviors of liquid waste temperature and nitric acid concentration were in good agreement with the experimental results.